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This paper focuses on enhancing multiband isolation between two antenna elements in a reconfigurable multiple input multiple output (MIMO) system. The antennas are reconfigurable printed inverted F antennas (PIFA) that resort to two PIN diodes each to achieve frequency reconfiguration. The isolation between the antenna elements is proposed to be improved through the use of multiple nested slots in the common ground plane between the elements. These slots collectively act as a multi-band reject filter and improve the isolation at the various operational frequencies of the antenna system. The reconfigurable MIMO antenna system is proposed for integration into mobile devices with an operation that covers mobile communication applications.